US Bridges

Davis Road over Smith River

Good

Grafton County, New Hampshire · 95FT. RTE 4 · Structure no. 009901230010400

Built
2011
14 years old
Condition
Good
inspected August 2023
Type
Slab
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
335
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Davis Road over Smith River is a prestressed concrete slab carrying Davis Road over Smith River in Grafton County, New Hampshire. It was built in 2011, so it is 14 years old, younger than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 335 vehicles a day, roughly 4% of them trucks, projected to reach 495 by 2043. The structure is 34 ft (10.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesDavis Road
CrossesSmith River
Location95FT. RTE 4
Coordinates43.58126, -71.97664
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating64.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length34 ft (10.4 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic335 (2023)
Projected traffic495 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Davis Road over Smith River built?

It was built in 2011, making it 14 years old in 2025.

What condition is Davis Road over Smith River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Davis Road over Smith River carry?

About 335 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Davis Road over Smith River?

The structure is 34 ft (10.4 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Davis Road over Smith River?

It is owned by the City or Municipal Highway Agency.